Kyröläinen Heikki, Karinkanta Jari, Santtila Matti, Koski Harri, Mäntysaari Matti, Pullinen Teemu
Department of Biology of Physical Activity, University of Jyväskylä, 40114, Jyväskylä, Finland.
Eur J Appl Physiol. 2008 Mar;102(5):539-46. doi: 10.1007/s00421-007-0619-0. Epub 2007 Nov 27.
The purpose of the present study was to test the hypothesis that the magnitude of hormonal concentration alterations during a prolonged military field exercise with constant energy intake (EI) is influenced by changes in energy deficit (ED) induced by varying the exercise intensity. Basal serum hormone concentrations were measured in a group of healthy young male volunteers (n = 7) during a 20-day field exercise. During the first week of the exercise, the average ED was 4,000 kcal/day (P-I), in the second week only 450 kcal/day (P-II), and in the last week 1,000 kcal/day (P-III). During the first 5 days of the field exercise, significant increases in cortisol (COR, +32%) and growth hormone (GH, +616%) concentrations were observed, while insulin (INS, -70%), total testosterone (TES, -27%), free testosterone (TES(free), -26%) decreased. However, after these initial responses, COR and GH returned to the pre-exercise level by the beginning of P-II. Also TES and TES(free) recovered to the pre-exercise level by the beginning of P-III, and INS by the end of P-III. The concentration of TES (+29%) increased above the pre-exercise level by the beginning of P-III. Serum thyroxin (T(4)) concentration was significantly lesser (-12%) and urine urea concentration significantly higher (+78%) after the field exercise than before it. Therefore, it can be concluded that the lower levels of ED in the second and third phase (ED <1,000 kcal/day) allowed recovery of hormonal changes observed in the first phase with ED much greater than 1,000 kcal/day.
在能量摄入恒定（EI）的长时间军事野外演习期间，激素浓度变化的幅度受运动强度变化引起的能量亏空（ED）变化的影响。在一组健康年轻男性志愿者（n = 7）进行20天野外演习期间，测量其基础血清激素浓度。在演习的第一周，平均能量亏空为4000千卡/天（P-I），第二周仅为450千卡/天（P-II），最后一周为1000千卡/天（P-III）。在野外演习的前5天，观察到皮质醇（COR，+32%）和生长激素（GH，+616%）浓度显著升高，而胰岛素（INS，-70%）、总睾酮（TES，-27%）、游离睾酮（TES(free)，-26%）降低。然而，在这些初始反应之后，COR和GH在P-II开始时恢复到运动前水平。TES和TES(free)在P-III开始时也恢复到运动前水平，INS在P-III结束时恢复到运动前水平。到P-III开始时，TES浓度（+29%）升高至高于运动前水平。野外演习后血清甲状腺素（T(4)）浓度显著降低（-12%），尿尿素浓度显著升高（+78%）。因此，可以得出结论，第二和第三阶段较低水平的能量亏空（ED <1000千卡/天）使得在第一阶段观察到激素变化得以恢复，第一阶段的能量亏空远大于1000千卡/天。
